我怎样才能在自己的类中创建一个私有方法来反复使用

Question

i have this method which is in my main activity, but i want to use it in other classes, how can i write it into its own class so it can be called when ever? i have tried to make a java class called isCallable with a constructor called the same but im getting lost with what to put in the constructor thanks for any help

 private boolean isCallable(Intent intent) {

    if (intent == null) {
        return false;
    }
    List<ResolveInfo> list = getPackageManager().queryIntentActivities(intent,
            PackageManager.MATCH_DEFAULT_ONLY);
    return list.size() > 0;

}

Answer 1

Step #1: Create a Java class named HarropUtils .

Step #2: Implement the following static method on HarropUtils

static boolean isCallable(Context ctxt, Intent intent) {

    if (intent == null) {
        return false;
    }
    List<ResolveInfo> list = ctxt.getPackageManager().queryIntentActivities(intent,
            PackageManager.MATCH_DEFAULT_ONLY);
    return list.size() > 0;

}

Step #3: Call HarropUtils.isCallble() from wherever you need it, passing in a Context (eg, an Activity ) and the Intent to test.